Re: [PATCH 2/6] perf tools: Store clock references for -k/--clockid option
From: David Ahern
Date: Fri Jul 31 2020 - 12:36:00 EST
On 7/31/20 10:15 AM, Jiri Olsa wrote:
>> It might also want to be implemented in a loop and iteration with minimal
>> time delta is chosen to improve synchronization accuracy and also mitigate
>> possible context switches between gettimeofday() and clock_gettime() calls.
> right, we could make this more accurate.. I'll post some follow up
> change with that
If it is handled through vdso (e.g., x86) both calls should be very fast
with no context switches and the margin of error is well less than the
usec resolution in the output.